Color selection scheme for digital video watermarking
First Claim
1. A method for selecting a chrominance portion of a pixel to be watermarked, said selecting step employing a perception-based table that indicates for each of at least a plurality of possible pixels in a colorspace which, if any, of the chrominance portions should be selected for watermarking.
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Accused Products
Abstract
Determining a chrominance portion to be watermarked employs a perception-based table that indicates for various pixel values which of the chrominance portions, if any, should be selected for watermarking. Only the Y, U, and V values of a pixel are needed to access the table and determine which chrominance portion should be selected. However, the table may be represented such that it may be accessed using only R, G, and B values. The table may be modified so that it may indicate which of U or V should be selected, or that neither should be selected, indicating that this pixel should not be watermarked at all. Advantageously, the table may be simplified by employing some processing, because a large section of the table may be replaced by a simple test on the pixel values, e.g., U<128, to determine the selected chrominance portion.
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Citations
24 Claims
- 1. A method for selecting a chrominance portion of a pixel to be watermarked, said selecting step employing a perception-based table that indicates for each of at least a plurality of possible pixels in a colorspace which, if any, of the chrominance portions should be selected for watermarking.
- 17. Apparatus for supplying an indication as to which chrominance portion of a pixel of a video signal, if any, is better suited to be altered so as to carry additional watermark information, said apparatus comprising a perception-based table in a computer readable media for at least a portion of the possible pixel colorspace, said table specifying for pixels that are within said portion of said colorspace the chrominance portion to be indicated by said apparatus.
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20. A method for selecting a chrominance portion of a pixel to be watermarked, said selecting step employing a perception-based table that indicates for each of at least a plurality of possible pixels in a colorspace which, if any, of the chrominance portions most likely had watermark data added thereto.
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21. Apparatus for selecting a chrominance portion of a pixel to be watermarked, said apparatus comprising a perception-based table in a computer readable medium that indicates for each of at least a plurality of possible pixels in at least a portion of a colorspace which, if any, of the chrominance portions would be least likely to introduce a visible artifact should watermark data be added thereto.
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22. Apparatus for selecting a chrominance portion of a pixel to be watermarked, said apparatus comprising:
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a computer readable store containing a perception-based table that indicates for each of at least a plurality of possible pixels in at least a portion of a colorspace which, if any, of the chrominance portions should be selected for watermarking; and
means for accessing said store to determine which chrominance portion, if any, to select, when said pixel is one of said pixels in said portion of said colorspace. - View Dependent Claims (23)
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24. Apparatus for selecting a chrominance portion of a pixel to be watermarked, said apparatus comprising:
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a computer readable store containing a perception-based table that indicates for each of at least a plurality of possible pixels in at least a portion of a colorspace which, if any, of the chrominance portions most likely had watermarking data added thereto; and
means for accessing said store to determine which chrominance portion, if any, to select, when said pixel is one of said pixels in said portion of said colorspace
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Specification